Structure functional insights into calcium binding during the activation of coagulation factor XIII A

Scientific Reports
S. SinghArijit Biswas

Abstract

The dimeric FXIII-A2, a pro-transglutaminase is the catalytic part of the heterotetrameric coagulation FXIII-A2B2 complex that upon activation by calcium binding/thrombin cleavage covalently cross-links preformed fibrin clots protecting them from premature fibrinolysis. Our study characterizes the recently disclosed three calcium binding sites of FXIII-A concerning evolution, mutual crosstalk, thermodynamic activation profile, substrate binding, and interaction with other similarly charged ions. We demonstrate unique structural aspects within FXIII-A calcium binding sites that give rise to functional differences making FXIII unique from other transglutaminases. The first calcium binding site showed an antagonistic relationship towards the other two. The thermodynamic profile of calcium/thrombin-induced FXIII-A activation explains the role of bulk solvent in transitioning its zymogenic dimeric form to an activated monomeric form. We also explain the indirect effect of solvent ion concentration on FXIII-A activation. Our study suggests FXIII-A calcium binding sites could be putative pharmacologically targetable regions.

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Citations

Feb 14, 2021·Journal of Clinical Medicine·Nasim Shahidi HamedaniBernd Pötzsch
Feb 18, 2021·Carbohydrate Polymers·M Nivedhitha SundaramJayakumar Rangasamy
Apr 27, 2020·Analytical Biochemistry·Thomas SchmitzDiana Imhof
Oct 1, 2021·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Xiaowei YuanJinshan Guo

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Methods Mentioned

BETA
transfections
transfection
ELISA

Software Mentioned

Affinimeter
Chimera
Multiseq
Image lab
ConSurf
YASARA Structure package
HMMER
Autodock
analyzesecstr
VMD

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